import java.util.*;
abstract class Animal{
   abstract void sound();
}

class Dog extends Animal{
    void sound(){
        System.out.println("Woof");
    
    }
}
class Cat extends Animal{
    void sound(){
        System.out.println("Meow");
    }
}

class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        String name=sc.nextLine();
        Animal obj;
        if(Sc.hasNextInt){
            System.out.println("Invalid input");
        }
        else{
        if(name.equals("Dog")){
            obj=new Dog();
            obj.sound();
        }
        else if(name.equals("Cat")){
            obj=new Cat();
            obj.sound();
        }
        else{
            System.out.println("Invalid input");
        }
    }
    }
}